PROV-ISSUE-518: Data Model Section 5.2.4 [prov-dm]
http://www.w3.org/2011/prov/track/issues/518
Raised by: Luc Moreau
On product: prov-dm
http://www.w3.org/2011/prov/wiki/LC_Feedback#Data_Model_Section_5.2.4
ISSUE-463
The definition of a "primary source" implies that it is an entity when in fact the term qualifies the role that a given entity plays during the creation of a new entity, not the derivation itself. This might seem to be a minor point, but it is clearly different from both revision and quotation, both of which could be used when deriving a new entity from an entity used as a primary source.
It is also important to note that a given entity might be a primary source for one entity but not another ("primary source" is context-dependent).